docs: def get_config(key):
      '''
      Get an identicon configuration parameter.
  
      Precedance order is:
          - application config (`udata.cfg`)
          - theme config
          - default
      '''
      key = 'AVATAR_{0}'.format(key.upper())
      local_config = current_app.config.get(key)
      return local_config or getattr(theme.current, key, DEFAULTS[key])